Hydrolytic Heterocyclization of the 1,1,2,3,3‐Pentacyanopropene Salts

Salts of 5-amino-4-cyano-3-dicyanomethylene-2-pyrrolinone are formed by action of dilute aqueous solutions of alkalis on pentacyanopropenide-anion salts. These cyclic salts are transformed to 2,6-diamino-3,5-dicyanoisonicotinates by subsequent action of alkalis.